X53 Subfield: $y - Table identification - Schedule

Subfield $y contains the identification of the schedule that contains the table to which the classification number belongs. The identification of the table by which a classification number or span is further subarranged is contained in field 761 (Add or Divide Like Instructions) . Subfield $y is not repeatable ; it is input before the first element of the classification number in the first subfield $a.